The Sylvan Incubus is a common name for the plant Dendrophagia Necrofoenae, a member of the Necrofoenae family. Like all Necrofoenae, it feasts on the dead - but it is one of the few that actually murders it's prey, before it feasts.

-Court Herbologist Gertrard di Vini, from his tome "dyFoenis Terrae Modae" - On the Plants of New Terra

A silent vestige sits among the vine covered ruins in a forest that has overgrown who once lived here. No more towers rise among the skeletal remains of a seeming once vast city. Instead, carved into the face of a leveled statue of a man, peaceful in his dead slumber now are etched the words - Si vis pacem para bellum – If you want peace, prepare for war.

“Wait, is that the same Damn tree we’ve been seeing all day?”, Ured the strong demanded. “No… Yes, yes it is.” stammered Fenstill the mage.
“Well, I’m sorry, but I’ll have to kill you now…” said Ured, drawing his sword. “I understand,” said the mage, wondering why he got into the magic business anyway…

Demontrumpets, as illuded to by the name, are not normal plants, but are plants who hold their origin in the Abyss. Perhaps brought by summoned demons, perhaps created by a dark god for some purpose, perhaps simple plants mutated by an artifact of great evil.

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A people who believe it is incredibly impolite to speak to anybody they meet for the first time. They believe their actions should speak for them until they are comfortable in each others presence and can then trust each other. Only then would converstation be appropriate.